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I understand duty cycle. It has never exceeded 85% until that datalog. Problem is there's no big HP fuel systems for the GTO's, so I'd have to make my own system, surge tank, etc.

I came up with a...

Yes, set the P0068 t0 8000 rpms, I have that also. I assumed you had it shut off, sorry.

Jody

Are you positive the patch is in? Go into your tune and click on the HP OS symbol at the upper left and see if it shows patched 15000 or still shows unpatched 11500. When tuning you load calibration...

I know that also. These are 60's, I have a set of 75's also, but there aren't any real numbers to use them for the computer as GM doesn't have a proper scale for them. I tried them early on in the...

Well, thank you very much sir, it's worth a try.

Jody

Never noticed that. COT is disabled and P0068 is set to 8000 rpms. Of course, it's misfiring throughout the wot range at that boost level, but what caused the commanded afr to change?

Jody

I'm about at the end with this project. 05 GTO twin turbo with 402 LS2, 11 degree ET heads, and 15 psi twin turbo.

This is the last log I did today. At 14-15 psi it misfires pretty good at wot,...

Absolutely, until I put the 15000 HZ patch in correctly and raised the maf limit.

Jody

You're definitely out of injector, which is not safe. Ideally stay 80% or so, no more than 90% is ideal.

It only affects performance if you are leaning out due to running out of fuel, but even if...

Okay, caught a bit of dry weather so I went out to see if the changes made a difference. Now I can go 12 psi without issue. I was lean, so I changed my PE table where it was pegging the maf and took...

Got it and thanks. I'm going to continue this way for now, that sounds like it's a bit tricky. My boost has been incredibly steady throughout this, so hopefully that will continue.

Jody

What I do not understand is how halving the VE table helps on an LS2 at all. It doesn't use it with the MAF. I thought when the maf runs out, and if it doesn't fail it goes to the PE table, not VE...

Does that work with a blow through maf, since you aren't using the ve? I've been told that once the maf is pegged (as long as it doesn't fail which I hope I have stopped) that you do the rest of the...

OK, I'll keep playing. Thanks!

Jody

I can shut off the P103 dtc, but I've never got a dtc light for that. Above 10 psi I am at 1.2 g/cyl which I am told is the end. I'm hearing you can tune through PE beyond that, but have not figured...

Well, short of finding a way to extend the maf readings 10 psi is at the limit with this 402. When I go to 11.5 psi it maxes the g/cyl and the MAF HZ.

Kind of a bummer having a motor that can run...

Yes, it is set at 13500, and yes I am exceeding it with any more than 8 psi. It allows a max of 16384 HZ so I will change that. But won't it go to "0" at 15000 with your patch anyway, or will it hold...

I just e-mailed it to you, but I thought if the MAF was pegged you're done.

Thanks again!

Jody

Yeah, no 2 bar for the LS2's yet. Before I did the maf patch the car would shut off when it pegged. Now it acts like a rev limiter and breaks up, but guess it's still doing the same thing?
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The LS2's only show 88%. You can read it a different way to show 100%, but 88% is WOT. The 15000 patch is to extend the ls2 maf.

How do I get it into PE? I do have a handheld and in-car wideband,...

Dropped the boost as low as it would go (8 psi) and it seemed fine, though my maf lb/min maxes at 61.04 and stays there throughout the run. That equates to 462.42 g/sec, but it appears maxed to me as...

OK, I got the stock motor tuned well with the twin turbo kit and 8 psi of boost. But I have a 402 turbo-specific engine sitting here so I installed it this weekend.

I have the 15000HZ patch in. As...

Thanks. I may find out and I'll post what happens. I am re-installing my 402 with 11 degree ET Performance heads. I can run a lot more boost and since I was seeing high 12000's HZ with the stock LS2...

OK, been there, done that with this one before I applied the 15000 maf patch. I do have a couple questions you may be able to answer. If I hit 15000+ HZ now with the patch will it shut off or "0" out...

The trans and converter are going in now. Along with the 402 turbo build (LS2). Hopefully the swap gets rid of this.

The timing isn't changing at all, heck I can't find anything that's changing. I...